Ever since I upgraded my macOS to Mojave, I've been stuck with Preview 10 (an old trick to downgrade Preview to 9 is no longer working). I wouldn't mind, except text selection has now become invisible:
In the screenshot above, the word mechanisms is selected, and I can copy the text and paste it elsewhere, but it doesn't look selected. This is really annoying when I'm trying to select a large amount of text to copy and paste elsewhere.
Changing the text selection colour from Graphite (my current setting) to something else fixes the issue. Changing the accent colour in the Mojave dark mode to something other than grey automatically changes the text selection colour to the corresponding one, which again fixes the issue, but going back to Graphite (without changing the accent colour back to grey) reinstates the issue. If possible, I'd like to keep Graphite, as I like the way it looks.
Edit: Switching to light mode doesn't make a difference (Graphite is still invisible on Preview):
Is there a fix for this short of reinstalling the OS or switching to a different PDF-viewing app (I know Preview is abysmal, but it's convenient for several reasons)? Also, does anyone know why it happens?
Edit: I just tested it in Catalina (10.15.6, only tested dark mode), and Graphite works. The selection is rather light, but that's okay; at least it's visible. Seems to be a Mojave-only issue.
Best Answer
I had a similar issue on macOS Catalina 10.15.1.
Upgrading to 10.15.2 resolved the issue. Multiple Reddit users experiencing a similar issue confirmed the same as well.